Flat tappet cam life

[jdean]

Something does not seem right here - Mobil 1 is increasing ZDDP while Shell Rotella (which I use) is decreasing it?

[zrayr]

Originally Posted by jdean

Something does not seem right here - Mobil 1 is increasing ZDDP while Shell Rotella (which I use) is decreasing it?

http://www.mobiloil.com/USA-English/...t_Engines.aspx

Mobil is touting several weights of oil as being recommended for flat tappet engine designs. The 15W-50 weight seems to be one with the most ZDDP & phosphorus


http://www.mobiloil.com/USA-English/...AQs.aspx#FAQs3

"....Why are you reintroducing Mobil 1 15W-50? Have there been any changes to the formulation, or is it identical to the previous product?

Mobil 1 15W-50 is being reintroduced based on popular demand. Mobil 1 15W-50 provides higher viscosity, designed to provide extra protection for performance vehicles and vehicles that operate in severe service, such as towing, hauling and racing. Additionally, Mobil 1 15W-50 contains higher levels of anti-wear (ZDDP or Zinc DialkylDithioPhosphate) that may be required for certain racing applications and camshaft designs. This is a new Mobil 1 15W-50 formulation and is not the same as the product that was marketed a few years ago. ....."

Z. Ray